河南省近11年大气可降水量变化特征

Variation Characteristics of Atmospheric Precipitable Water in Henan in Recent 11 Years

利用2000-2010年1°×1°的NCEP FNL分析资料,分析了河南大气可降水量的时空分布特征及变化趋势。结果表明:河南省年大气可降水量为270.48 kg/m2,从西北向东南逐渐增加。可降水量季节变化显著,夏季最大,月平均为41.77 kg/m2;冬季最少,月平均为8.54 kg/m2。1月份大气可降水量最少,平均为8.04 kg/m2;7月最多,平均为47.19 kg/m2。11 a来,大气可降水量最多年份是最少年份的1.12倍,大气可降水量年际变化特征不明显,总体上有所减少。

Based on the NCEP FNL analysis data （1°×1°） from 2000 to 2010, this paper analyzed the temporal-spatial distribution characteristics and variation tendency of the atmospheric preeipitable wa- ter over Henan province. The results showed that ： annual precipitable water in Henan is 270.48 kg/m2 , and it increases gradually from northwest to southeast. Preeipitable water varies with season obviously, which is most in summer （ monthly average 41.77 kg/m2 ） and least in winter （ monthly average 8.54 kg/ m2）. The monthly atmospheric precipitable water is least in January （8.04 kg/m2） and most in July （47.19 kg/m2）. In recent 11 years, precipitable water the most year is 1.12 times as much as that the least year, the interannual variation is not so obvious, and the overall prieipitable water shows a slight reduction.